1) A membranous tissue fold that occuludes the vaginal orifice from the ramrod. A hymen or cherry.

2) A cone existing on a level curve that contacts the tangent surface.

1:"Take a good look at your monge cone; this is the last time you'er ever going to see it!"
2:Mot screamed to the ramrod, "If you want to get to the bloody monge cone, you're going to have to get through me first, mate"